Creation+of+the+Universe+-+AJ

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 * [[image:http://img.timeinc.net/time/daily/2009/0908/big_bang_0812.jpg width="525" height="294" caption="http://www.nasa.gov/vision/universe/starsgalaxies/hubble_UDF.html"]] || [[image:http://t2.gstatic.com/images?q=tbn:ANd9GcRiavyKZ05AjHz7oZEzaaTZj_oE5Pcn9ckXMBPLM5QHjSLNdPzf width="248" height="245" caption="images?q=tbn:ANd9GcRiavyKZ05AjHz7oZEzaaTZj_oE5Pcn9ckXMBPLM5QHjSLNdPzf"]] ||  ||
 * [[image:http://science.nasa.gov/media/medialibrary/2012/03/01/Big_BANG.png width="222" height="203" caption="Big Bang"]] ||  ||   ||

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**Topic: Research For** **Explaining the big bang theory.**

**Notes**

[[image:tmsmawakasci3/sticky-pads_300.jpg width="58" height="68" align="left"]].
There are many misconceptions surrounding the Big Bang theory. For example, we tend to imagine a giant explosion. Experts however say that there was no explosion; there was (and continues to be) an expansion. Rather than imagining a balloon popping and releasing its contents, imagine a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe.

There are two types of polarization signals from the microwave background, which scientists call E and B modes. The E mode points to the era of reionization, when the universe, after cooling down for millions of years, became warm again with new stars. These first stars ionized hydrogen atoms, liberating electrons from the protons, which scattered and polarized the big bang afterglow. The new WMAP data indicate that reionization, and thus star formation, occurred 400 million years after the Big Bang, the most accurate assessment to date.

B modes point way back to the inflationary epoch, the calling card of the Big Bang. Inflation attempts to resolve two problems with the Big Bang theory: The universe is flat and uniform. Sure, any space will reach equilibrium given enough time. But the universe was at a uniform temperature at age 380,000 years. Energy would have had to move over 100 times the speed of light to make things that uniform that early. Inflation provides the speed. Inflation also expands the universe quickly enough to flatten out any wrinkles in spacetime that could have been created by gravity or would have caused the nascent universe to implode.

Before the twentieth century, astronomers could only assume that the universe had existed forever without change, or that it was created in its present condition by divine action at some arbitrary time. Evidence that the universe may be evolving did not begin to accumulate until the 1920s. Today, the scientific theory that all matter in the universe was created from a gigantic explosion called the "big bang" is widely accepted. It was Albert Einstein's theory of relativity, published in 1915, which set the stage for the conceptual development of an expanding universe

The night sky presents the viewer with a picture of a calm and unchanging Universe. So the 1929 discovery by Edwin Hubble that the Universe is in fact expanding at enormous speed was revolutionary. Hubble noted that galaxies outside our own Milky Way were all moving away from us, each at a speed proportional to its distance from us. He quickly realized what this meant that there must have been an instant in time (now known to be about 14 billion years ago) when the entire Universe was contained in a single point in space. The Universe must have been born in this single violent event which came to be known as the "Big Bang."